Wyniki wyszukiwania - BazTech

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Zastosowanie atrybutów sejsmicznych w konstrukcji modelu petrofizycznego na przykładzie mioceńskich utworów zapadliska przedkarpackiego

Zych I., Smółka-Gnutek P.

Przegląd Geologiczny

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2014

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Vol. 62, nr 12

848-–851

EN

The aimof this studywas to predict reservoir parameters distribution in Miocene deposits. The area of interest is located in the Carpathian Foredeep, where many deposits of natural gas such as Sędziszów (Zagórzyce), Nosówka and Góra Ropczycka are known. The results of the analysis verified existing gas fields and identified new anomalous zones. The main advantage of presented method is the integration of geological, petrophysical and seismic data. For the purpose of modelling of petrophysical parameters distribution (e.g. porosity, density, gamma ray), results of inversion, well logs and seismic attributes were used. On the basis of structural interpretation of 3D seismic data, the structure framework was built. The entire model was divided into four Miocene's complexes and then split it into layers of 10 m thickness. All used well logging data were scaled to the spatial resolution of the structural model. Estimation of petrophysical parameters was performed using advanced algorithms available in Petrel (Neural Net, Gaussian Random Function Simulation). A number of seismic attributes (e.g. Sweetness, Envelope, Local Flatness, Relative Acoustic Impedance, Dominat Frequency, Chaos, Acoustic Impedance) were used to steer the distribution of petrophysical well data. The study provided information about the distribution of petrophysical properties at every point of the spatial model of Miocene complex. The results show high correlation of seismic attributes and petrophysical properties of the data from the area of Góra Ropczycka–Iwierzyce 3D seismic project. On the basis of all available reservoir information, geobodies have been extracted. Petropysical model prediction is fundamental in understanding clastic reservoirs and should be used for prospect identification.

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Wstępne wyniki modelowań przestrzennych (3D) parametrów petrofizycznych skał podczas poszukiwań stref występowania gazu zamkniętego w polskim basenie czerwonego spągowca

Papiernik B., Górecki W., Pasternacki A.

Przegląd Geologiczny

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2010

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Vol. 58, nr 4

352-364

EN

The Rotliegend Basin is filled with terrigenic complex over 1200 m in thickness. The complex comprises sediments of eolian, fluvial and playa depositional systems (Fig. 1). Reservoir volume of the pore space accessible for the reservoir media is ca. 830-990 km3. Gas exploration in this stratigraphic unit is now focused at depths of around 3000-3800 m b.s.l., in the near-top zone. Poor reservoir properties, especially permeabilities, are here the limiting factor for conventional exploration. A change in the prospecting strategy to comprise tight gas targets moves research into the deeper zone covering the whole profile of the Rotliegend. The paper presents preliminary results of 3D modeling of lithofacies and related petrophysical parameters variability. The static model was created with the use of Petrel 2009.2. Structural framework was built using regional structural, isopach and facies maps. It was relatively detailed, comprising 9 576 000 cells organized in 3 zones and 60 layers. To estimate facies model, the authors used results of integrated environmental analysis of core data and logs from 117 wells (Fig. 2 ). Models of clay content (Vsh) and porosity (PHI) were based on logs from 75 wells. The obtained results show that the northern margin of the Eastern Erg is characterized by presence of numerous eolian strata with porosity ranging from 5 to 15%. Their quality, quantity and thickness decrease toward the north, along with increase in depth. Modeling results indicate that the dominating porous layers of eolian sandstones and fluvial inserts are often intercalated with "non-reservoir" layers revealing porosity below 5%. In this zone, a deeper part of the Rotliegend section should be investigated more thoroughly (Fig. 5, 6, 9). The Pomeranian sector of the Central Basin is dominated by playa and fluvial sediments (Fig. 7, 8, 10). Slightly clayey eolian strata make a few, laterally discontinuous intercalations. Gas accumulations could be expected within local, laterally confined interlayers of eolian and fluvial sandstones with porosity of around 5-12%. Due to the location in the near-base part of the Rotliegend section, close to Carboniferous source rocks, they may be filled with gas, forming so-called sweet spots. Probability of gas occurrence in Pomerania is high as indicated by the Międzyzdroje gas field or small accumulation found in Piaski-PIG2 well. The presented preliminary study allowed to test usability of 3D modeling in tight gas prospecting. Fully reliable results will be obtained after increasing precision of the models comprising detailed seismic interpretation, the use of seismic attributes, and inclusion of quantitative data in diagenetic processes and sedimentology of layers in the modeling process.

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Opracowanie wykształcenia litologicznego oraz kalibracja modeli służących do określania parametrów zbiornikowych skał w rejonie złoża Radoszyn

Kozłowski M., Wolański K., Chmielowiec-Stawska A.

Nafta-Gaz

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2009

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R. 65, nr 6

445--453

PL

W ramach pracy wykonano pomiary laboratoryjne właściwości rdzeni wiertniczych, obejmujące następujące badania: porozymetryczne, przepuszczalności absolutnej i fazowych skał dla wody i gazu, składu mineralnego skał na podstawie analiz rentgenowskich, rozkład nasycenia wodą przestrzeni porowej metodą NMR, zawartości pierwiastków promieniotwórczych uranu, toru i potasu oraz parametrów elektrycznych skał. Na podstawie otrzymanych wyników badań laboratoryjnych przeprowadzono kalibrację geofizycznych modeli interpretacyjnych, której efektem końcowym była kompleksowa interpretacja pomiarów geofizyki wiertniczej dla poszczególnych otworów. W oparciu o wyniki badań laboratoryjnych i interpretację materiałów geofizyki wiertniczej podjęto próbę konstrukcji teoretycznych kształtów stref przejściowych ropa-woda złożowa oraz przedstawiono procedurę obliczania zawodnienia ze znormalizowanych ciśnień kapilarnych.

EN

Within frameworks of the study laboratory measurements of drilling cores properties have been done, including: porosimetric testing, absolute and phase permeabilities of rocks for water and gas, mineral composition of rocks on the grounds of X-ray analyses, distribution of pore space water saturation with use of NMR method, contents of uranium, thorium and potassium radioactive elements, electrical parameters of rocks. On the grounds of obtained laboratory tests results, complex calibration of geophysics interpretation models was performed, resulting finally in complex interpretation of well logging for individual boreholes. Based on laboratory tests results and interpretation of geophysics well logging materials an attempt has been made to construct theoretical shapes of oil – reservoir water transition zones.

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Identyfikacja modelu petrofizycznego klastycznych skał zbiornikowych kambru i dewonu południowej części bloku górnośląskiego

Glazor A., Twardowski K.

Prace Instytutu Górnictwa Naftowego i Gazownictwa

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2000

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nr 110 wyd. konferencyjne

417--422

EN

A quantitative characteristic of the basic reservoir-filtration properties of clastic rocks of the Cambrian and Devonian starta deposited under the carbonaceous Devonian complex has been presented in the paper. It is based on the results of laboratory tests of cores coming from the wells owned by the Polish Institute of Geology and GEONAFTA Company in the south part of the Upper Silesian block - extending from the region of Bielsko Biała through Andrychów and Myślenice towards Bochnia. The basic elements of the work are regression prediction models enabling a quantitative evaluation of absolute permeability of rocks based on their selected petrophysical parameters, especially capillary parameters obtained through the mercury porosimetry methods.